| 21st Century Network Cabling | 21st Century Network Cabling | — | (310) 918 9840 | Other | Menifee · Riverside County | — | — |
| 21st Century Painting | 21st Century Painting | — | (818) 517 1603 | Windows, patio, painters | Reseda · Los Angeles County | — | — |
| 21st Century Painting And Waterproofing | 21st Century Painting And Waterproofing | — | (310) 365 0277 | Windows, patio, painters | Joshua Tree · San Bernardino County | — | — |
| 21st Century Pool Maintenance | 21st Century Pool Maintenance | — | (619) 995 5105 | Pool | Santee · San Diego County | — | — |
| 21st Century Sterling INC | Stephen William Marvin | — | (310) 313 4633 | Electricians | Los Angeles · Los Angeles County | — | — |
| 22 Builders Co | Luis Reynaldo Pacheco | — | (562) 547 3409 | GC, remodel, ADU | La Habra · Orange County | — | — |
| 220 Construction INC | Davit Simonyan | — | (818) 531 8449 | Electricians | Tujunga · Los Angeles County | — | — |
| 220 Electric INC | Simonyan Davit | — | (323) 531 8777 | Electricians | Tujunga · Los Angeles County | — | — |
| 23 1/2 Hour Home Services INC | Kelly Michael Russum | — | (760) 327 8718 | HVAC | Palm Springs · Riverside County | — | — |
| 23 1/2 Hrs Plumbing | Jesus Eduardo Arcos Ramirez | — | (323) 245 5246 | Other | Harbor City · Los Angeles County | — | — |
| 23 1/2 Hrs S O S Plumbing INC | Francisco Javier Macias | — | (626) 786 4999 | Other | Montclair · San Bernardino County | — | — |
| 23 Home Improvement | 23 Home Improvement | — | (310) 220 1999 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| 23bc Development | Jenn Tamayo Bareng | — | (747) 888 3400 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| 24 - 7 Drilling INC DBA 24 - 7 Water Well Drilling | Donald Wayne Kinloch | — | (951) 581 2783 | Other | Norco · Riverside County | — | — |
| 24 - Hour Express Services INC | Michael Lee Weimann | — | (951) 302 5320 | HVAC | Murrieta · Riverside County | — | — |
| 24 / 7 Concrete INC | Pintos Nathan | — | (408) 426 6169 | Other | San Jose · Santa Clara County | — | — |
| 24 / 7 Electric | Luis Alonso Lopez | — | (626) 823 0498 | Electricians | Baldwin Park · Los Angeles County | — | — |
| 24 / 7 Fire Protection Services Incorporated | Richard William Jr Cronin | — | (562) 698 3830 | Other | Santa Fe Springs · Los Angeles County | — | — |
| 24 / 7 Pro Construction INC | Zeena George Alsheikh | — | (619) 607 2507 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| 24 / 7 Trucking INC | Kevin Darrell Gilliam | — | (619) 262 5171 | Other | San Diego · San Diego County | — | — |
| 24 7 Protection INC | Arthur Michael Livermore | — | (760) 200 0155 | Electricians | Thousand Palms · Riverside County | — | — |
| 24 Apartment Complex Services INC | Mohamad| Alzgou L Mohamad Al Zgoul | — | (951) 686 7171 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| 24 Hour Bath Enterprises INC | Daniel Guy Liechty | — | (949) 263 0779 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| 24 Hour Bathtub Refinishers | Miguel Cano Lopez | — | (619) 990 9944 | Other | La Mesa · San Diego County | — | — |
| 24 Hour Construction INC | Junio Da Silva Costa | — | (415) 215 8300 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| 24 Hour Garage Door Pro | 24 Hour Garage Door Pro | — | (805) 501 0603 | Other | Simi Valley · Ventura County | — | — |
| 24 Hour Handyman And Contractor | 24 Hour Handyman And Contractor | — | (714) 955 7907 | GC, remodel, ADU | Long Beach · Los Angeles County | — | — |
| 24 Hour Plumbing And Leak Detection | Tuan Ba Pham | — | (619) 885 5960 | Other | San Diego · San Diego County | — | — |
| 24 Hour Restoration & Construction | Bobby Mahmud Ameen | — | (949) 407 6800 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| 24 Hour Rooter INC | Kheirian Diznab Ramin | — | (661) 400 1002 | Other | Palmdale · Los Angeles County | — | — |
| 24 Hour Water Damage | Nick James Angelopoulos | — | (626) 626 5543 | GC, remodel, ADU | Hacienda Heights · Los Angeles County | — | — |
| 24 Hours Garage Door And Gates Repair | Peretz Adi | — | (818) 205 4431 | Other | Winnetka · Los Angeles County | — | — |
| 24 Hr Plumbing | Luis Alberto Davila | — | (310) 973 2066 | Other | Lawndale · Los Angeles County | — | — |
| 24 Hr River City Locksmith | 24 Hr River City Locksmith | — | (916) 397 0965 | Other | Sacramento · Sacramento County | — | — |
| 24 Hr Sprinklers INC | Ryan Leslie Hall | — | (805) 208 6900 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| 24 Kt Green | 24 Kt Green | — | (805) 377 5364 | Windows, patio, painters | Moorpark · Ventura County | — | — |
| 24 Kva Electric INC | Victor Alfonso Rosales | — | (310) 686 0642 | Electricians | Sacramento · Sacramento County | — | — |
| 24 Prefab LLC | Mario Salvatore Romano | — | (310) 243 6967 | GC, remodel, ADU | Santa Monica · Los Angeles County | — | — |
| 24 Rooter & Plumbing INC | Gabriel Jovani Robles | — | (626) 322 1538 | Other | Claremont · Los Angeles County | — | — |
| 24 Security Fire Alarm & Electric | Jea Chun Shin | — | (213) 216 2889 | Electricians | Irvine · Orange County | — | — |